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Resistor and its types

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Resistor, Types of resistor, Example, colour code

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Resistor and its types

1. 1. 1. WHAT IS RESISTOR ? 2. TYPES OF RESISTOR. 3. CONNECTION OF RESISTOR. 4. RESISTOR COLOUR CODE 5. RESISTOR POWER RATING
2. 2. A RESISTOR IS A PASSIVE TWO - TERMINAL ELECTRICAL COMPONENT THAT IMPLEMENTS ELECTRICAL RESISTANCE AS A CIRCUIT ELEMENT. THE RATIO OF THE VOLTAGE APPLIED ACROSS A RESISTOR'S TERMINALS TO THE INTENSITY OF CURRENT THROUGH THE CIRCUIT IS CALLED RESISTANCE. THIS RELATION IS REPRESENTED BY OHM'S LAW: V=IR
3. 3. UNIT & SYMBOL  THE OHM (SYMBOL: Ω) IS THE SI UNIT OF ELECTRICAL RESISTANCE, NAMED AFTER GEORG SIMON OHM.  AN OHM IS EQUIVALENT TO A VOLT PER AMPERE  OTHER DERIVED UNITS ARE MILLI OHM (1 MΩ = 10−3 Ω), KILO OHM (1 KΩ = 103 Ω), AND MEGA OHM (1 MΩ = 106 Ω). FIXED RESISTOR VARIABLE RESISTOR
4. 4. TYPES OF RESISTOR
5. 5. TYPES OF RESISTOR RESISTOR FIXED RESISTOR VARIABLE RESISTOR
6. 6. FIXED RESISTOR CARBON COMPOSITE RESISTOR FILM RESISTOR WIRE WOUND RESISTOR RESISTANCE WIRE VARIABLE RESISTOR RHEOSTAT POTENTIOMETER THERMISTOR HUMISTOR VARISTOR PHOTORESISTOR
7. 7. CARBON COMPOSITE RESISTOR LOW INDUCTANCE IDEAL FOR HIGH FREQUENCY APPLICATIONS VERY CHEAP TO MAKE HAVE VERY LARGE TOLERANCES
8. 8. FILM RESISTOR THE RESISTIVE VALUE OF THE RESISTOR IS CONTROLLED BY INCREASING THE DESIRED THICKNESS OF THE DEPOSITED FILM. RESISTANE UPTO 10MΩ CAN BE OBTAINED. HAVE TOLERANCE 1% OR LESS
9. 9. WIRE WOUND RESISTOR MADE BY WINDING A THIN METAL ALLOY WIRE ONTO AN INSULATING CERAMIC FORMER IN THE FORM OF A SPIRAL HELIX  AVAILABLE IN VERY LOW OHMIC AND HIGH PRECISION VALUES (FROM 0.01 TO 100KΩ)
10. 10. RHEOSTAT RHEOSTAT IS A ADJUSTABLE RESISTOR USED IN APPLICATIONS THAT REQUIRE ADJUSTMENT OF CURRENT OR VARYING OF RESISTANCE IN AN ELECTRIC CIRCUIT A SPECIAL TYPE OF RHEOSTAT IS THE POTENTIOMETER
11. 11. POTENTIOMETER A POTENTIOMETER IS, A POT, IN ELECTRONICS TECHNOLOGY IS A THREE-TERMINAL RESISTOR WITH A SLIDING CONTACT THAT FORMS AN ADJUSTABLE VOLTAGE DIVIDER. POTENTIOMETERS ARE COMMONLY USED TO CONTROL ELECTRICAL DEVICES SUCH AS VOLUME CONTROLS, JOYSTICKS ETC.
12. 12. THERMISTOR A THERMISTOR IS A TYPE OF RESISTOR WHOSE RESISTANCE VARIES SIGNIFICANTLY WITH TEMPERATURE THERMISTORS CAN BE USED AS CURRENT-LIMITING DEVICES FOR CIRCUIT PROTECTION, AS REPLACEMENTS FOR FUSES
13. 13. HUMISTOR A HUMISTOR IS A TYPE OF RESISTOR WHOSE RESISTANCE VARIES SIGNIFICANTLY WITH HUMIDITY A HUMIDITY SENSOR MEASURES THE HUMIDITY LEVEL BY MEASURING THE CHANGE IN THE RESISTANCE OF AN ELEMENT
14. 14. VARISTOR  A VARISTOR (OR VOLTAGE DEPENDENT RESISTOR ) FUNCTION IS TO CONDUCT SIGNIFICANTLY INCREASED CURRENT WHEN VOLTAGE IS EXCESSIVE. HIGH VOLTAGE VARISTOR
15. 15. PHOTORESISTOR A PHOTORESISTOR OR LIGHT DEPENDENT RESISTOR (LDR) EXHIBITS PHOTOCONDUCTIVITY. PHOTORESISTORS IN MANY CONSUMER ITEMS SUCH AS STREET LIGHTS, CLOCK RADIOS, ALARM DEVICES ETC
16. 16. CONNECTION OF RESISTORS
17. 17. SERIES CONNECTION IN SERIES CONNECTION, THE CURRENT REMAINS CONSTANT. (i.e. I = I1 = I2 = …. = In ) IN SERIES CONNECTION, VOLTAGE ADDS UP. (i.e. V = V1 + V2 + …. + Vn)
18. 18. PARALLEL CONNECTION IN PARALLEL CONNECTION, THE VOLTAGE REMAINS CONSTANT. (i.e. V = V1 = V2 = …. = Vn) IN PARALLEL CONNECTION, CURRENT ADDS UP. (i.e. I = I1 + I2 + …. + In )
19. 19. RESISTOR COLOUR CODE
20. 20. RESISTOR VALUE = XY * Z ± TOLERANCE EXAMPLE:FIND THE RESISTANCE OF THE GIVEN RESISTOR ?
21. 21. COLOUR CODE TABLE COLOUR DIGIT MULTIPLIER TOLERANCE BLACK 0 100 - BROWN 1 101 ± 1% RED 2 102 ± 2% ORANGE 3 103 - YELLOW 4 104 - GREEN 5 105 ± 0.5% BLUE 6 106 ± 0.25% VIOLET 7 107 ± 0.1% GREY 8 108 - WHITE 9 109 - GOLD - 10-1 ± 5% SILVER - 10-2 ± 10% NONE - - ± 15%
22. 22. POWER RATING
23. 23. RESISTOR POWER RATING THE POWER RATING OF RESISTORS CAN BE CALCULATED USING THE FORMULA :- THE LARGER THE POWER RATING, THE GREATER THE PHYSICAL SIZE OF THE RESISTOR. WHEN USED IN AC CIRCUITS THE AC IMPEDANCE OF A RESISTOR IS EQUAL TO ITS DC RESISTANCE.
24. 24. CITATION www.google.com en.wikipedia.org www.electronics-tutorials.ws